Which tool is required to remove an 8 notch freewheel from a single-speed flip-flop hub? - Bicycles Stack Exchange
Universal freewheel remover 1722/2BI | No more struggling with removal of the sprocket on the threaded hubs. This tool, is a huge time saver and makes removal of the sprocket a breeze. #
High Precision Single Speed Freewheel Remover for 4-notch BMX Single-speed | eBay